A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . Aggregate in Fresh Concrete (34) „ (22) X X (31) ^^ 39. Absolute Volume Water in Fresh Concrete ,. x (62 ±) ^-^^4 40. Total Absolute Volume Materials (36) + (37) + (38) + (39) ? . 41. Density (36) +(37) + (38) 42. Remarks Computed by G. by S. E. to Tools and Trays. Divide the Total Loss, (15) —[(18) +(19)], by Estimationinto Items (20) and (21)- STRENGTH OF PLAIN CONCRETE 39: by the capacity of the testing machine. The Emery Mac
A treatise on concrete, plain and reinforced : materials, construction, and design of concrete and reinforced concrete; 2nd ed. . Aggregate in Fresh Concrete (34) „ (22) X X (31) ^^ 39. Absolute Volume Water in Fresh Concrete ,. x (62 ±) ^-^^4 40. Total Absolute Volume Materials (36) + (37) + (38) + (39) ? . 41. Density (36) +(37) + (38) 42. Remarks Computed by G. by S. E. to Tools and Trays. Divide the Total Loss, (15) —[(18) +(19)], by Estimationinto Items (20) and (21)- STRENGTH OF PLAIN CONCRETE 39: by the capacity of the testing machine. The Emery Machine at theWatertown Arsenal, one of the largest in the world, has a capacity of800 OOP pounds, and the authors have had 12-inch concrete cubes testedthere which reached this Hmit, so that 12 inches on a side may be fixed ingeneral as the maximum size for specimens. For a lower limit it is doubtfulif specimens less than 6 inches square can be made to give accurate series of comparative tests by the authors upon 8-inch and 12-inch cubesgave much higher breaking strength per square inch for the larger size. Fig. for Concrete Cubes. {See p. 395.) specimens. It was evident from the lower unit weight of the smallerspecimens, that the difference was due, at least in part, to variation inhomogeneity. Cubes have been the common form of compression specimens and aresuitable for comparative tests of ultimate breaking strength, but for study-ing the real value of concrete in compression, or for determination ofelastic properties, long prisms are preferable. For column tests, the length of a specimen should be at least five timesthe largest lateral dimension. Both theory and practice show that beyondthis point there is but little variation in the strength per square inch, pro-viding the loading is central. See p. 369. 398 A TREATISE ON CONCRETE The specimen recommended for crushing tests by the Joint Committeeon Concrete and Reinforced Concrete, and used at the U.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1912
